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Current work demonstrates a new method and a new device for simultaneous in vivo measurements of sarcomere imaging and fiber tension. Sarcomere, a building block of muscles, plays a critical role in muscle contraction. In the pathological conditions, the biomechanical properties of sarcomere and muscle fibers may be altered significantly. We developed a novel methodology by combining the optical image...
Spasticity is often seen in patients with central nervous system lesion, such as stroke. It hinders functional movement and may induce pain. Current measures for assessing Spasticity are either quantitative but not convenient to use or convenient to use in clinics but lack of objective quantification. We developed a manual spasticity evaluator (MSE) to evaluate the spasticity quantitatively and potentially...
Patients post stroke showed substantial changes in biomechanical properties of the ankle and knee joints. However, it is not clear what the underlying mechanisms are in the hypertonic calf muscles in stroke survivors. Biomechanical properties of the medial gastrocnemius muscle in both stroke survivors and healthy subjects were investigated in vivo and noninvasively. A programmable electrical stimulator...
A new method to accurately measure the mechanical properties of individual muscles and tendons under active contraction is presented. An individual muscle is activated selectively to different intensities through electrical stimulation with adjustable amplitude, frequency, and pulse width. During the course of active contraction of the stimulated muscle, muscle fiber pennation angle, muscle fascicle...
Study of individual elbow muscles' mechanical actions is important in understanding the muscles' fundamental roles in performing various motor tasks. It also helps us gain insights into the compensatory mechanisms for elbow injuries like the ulnar collateral ligament (UCL) injury, which is a common sports-related injury. The mechanical actions of individual elbow muscles and their roles in loading/unloading...
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